Sirius Black is a fictional character in J. K. Rowling's Harry Potter series, played by Gary Oldman. Black, also known as Padfoot or Snuffles (in his Animagus form) was a pure-blood wizard, the older son of Orion and Walburga Black, and the brother of Regulus Black. He is Harry Potter's godfather. He was the best friend of Harry's dad, James Potter, along with Remus Lupin and Peter Pettigrew. These four were known as the marauders in their school days, and created the Marauder's Map.
He, along with his three friends, belonged to Gryffindor house when at Hogwarts, unlike the rest of his family, who had belonged to the house of Slytherin. He disliked his family a lot, and ran away from home to James Potter's house when he was 16. His prized possession in his childhood was a flying motorbike.
Sirius was an animagus and was able to transform into a big black dog ( a grim, which is an omen of death) at will. This is how he escaped from the wizard prison, Azkaban after being kept there twelve years for a crime that he did not commit (the murder of Peter Pettigrew and 13 muggles with only one curse). Harry found out, after a year of believing otherwise, that Sirius was an innocent man, and helped him evade capture from the wizarding government. Sirius went on the run before returning to his (empty) childhood home and offered it up as headquarters for the Order of the Phoenix upon Voldemort's return. He was killed in a battle at the Ministry of Magic by his cousin, a Death Eater, Bellatrix Lestrange in Harry's 5th year at Hogwarts. Sirius Black returns in the 7th book, Harry Potter and the Deathly Hallows, during Harry's dream scene.
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